They are both pulse generators.
They read the pulse, that is generated, with the exact same way:

a coil is triggered by the movement of magnetic stream flow inside the iron core it is twisted around of and a low voltage instant current is flowing through that coil which is picked up by the ECU.
So you should name the fault indication by the sensor's name.

Right.
18 is the Cam pulse generator and 19 is the Ignition pulse generator.
I've seen a few code 19 issues discussed here, but I haven't seen any code 18 issues yet. Anyway, both of them are pretty straight forward diagnosis.

Since it's a 4-stroke engine, the flywheel will make 2 complete rotations per cycle.
As a DOHC system. The cams make one revolution per cycle.
Therefore, the flywheel pulse generators will have two sets of pulses while the cam pulse generator will have one.
Therefore, the ECU will know the crank/piston is at proper timing and using the cam pulse timing to trigger spark firing for each cylinder.

Register Now

In order to be able to post messages on the Honda RC51 Forum : RC51 Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:

Password

Please enter a password for your user account. Note that passwords are case-sensitive.